129969944 has 32 divisors (see below), whose sum is σ = 263088000. Its totient is φ = 59837952.

The previous prime is 129969943. The next prime is 129970019. The reversal of 129969944 is 449969921.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129969943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48512 + ... + 51120.

It is an arithmetic number, because the mean of its divisors is an integer number (8221500).

Almost surely, 2^129969944 is an apocalyptic number.

It is an amenable number.

129969944 is an abundant number, since it is smaller than the sum of its proper divisors (133118056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129969944 is a wasteful number, since it uses less digits than its factorization.

129969944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3107 (or 3103 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 53.

The square root of 129969944 is about 11400.4361320083. The cubic root of 129969944 is about 506.5406584920.

The spelling of 129969944 in words is "one hundred twenty-nine million, nine hundred sixty-nine thousand, nine hundred forty-four".